#pragma once

#include <iostream>
#include <string>
#include <strings.h>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <functional>
#include "Log.hpp"

// using func_t = std::function<std::string(const std::string&)>;
typedef std::function<std::string(const std::string &)> func_t;

Log lg;

enum
{
  SOCKET_ERR = 1,
  BIND_ERR
};

uint16_t defaultport = 8080;
std::string defaultip = "0.0.0.0";
const int size = 1024;

class UdpServer
{
public:
  UdpServer(const uint16_t &port = defaultport, const std::string &ip = defaultip) : sockfd_(0), port_(port), ip_(ip), isrunning_(false)
  {
  }
  void Init()
  {
    // 1. 创建udp socket
    sockfd_ = socket(AF_INET, SOCK_DGRAM, 0); // PF_INET
    if (sockfd_ < 0)
    {
      lg(Fatal, "socket create error, sockfd: %d", sockfd_);
      exit(SOCKET_ERR);
    }
    lg(Info, "socket create success, sockfd: %d", sockfd_);
    // 2. bind socket
    struct sockaddr_in local;
    bzero(&local, sizeof(local));
    local.sin_family = AF_INET;
    local.sin_port = htons(port_);                  // 需要保证我的端口号是网络字节序列，因为该端口号是要给对方发送的
    local.sin_addr.s_addr = inet_addr(ip_.c_str()); // 1. string -> uint32_t 2. uint32_t必须是网络序列的 // ??
    // local.sin_addr.s_addr = htonl(INADDR_ANY);

    if (bind(sockfd_, (const struct sockaddr *)&local, sizeof(local)) < 0)
    {
      lg(Fatal, "bind error, errno: %d, err string: %s", errno, strerror(errno));
      exit(BIND_ERR);
    }
    lg(Info, "bind success, errno: %d, err string: %s", errno, strerror(errno));
  }
  void Run(func_t func) // 对代码进行分层
  {
    isrunning_ = true;
    char inbuffer[size];
    while (isrunning_)
    {
      struct sockaddr_in client;
      socklen_t len = sizeof(client);
      ssize_t n = recvfrom(sockfd_, inbuffer, sizeof(inbuffer) - 1, 0, (struct sockaddr *)&client, &len);
      if (n < 0)
      {
        lg(Warning, "recvfrom error, errno: %d, err string: %s", errno, strerror(errno));
        continue;
      }
      inbuffer[n] = 0;
      std::string info = inbuffer;
      std::string echo_string = func(info);
      sendto(sockfd_, echo_string.c_str(), echo_string.size(), 0, (const sockaddr *)&client, len);
    }
  }
  ~UdpServer()
  {
    if (sockfd_ > 0)
      close(sockfd_);
  }

private:
  int sockfd_;     // 网路文件描述符
  std::string ip_; // 任意地址bind 0
  uint16_t port_;  // 表明服务器进程的端口号
  bool isrunning_;
};